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arXiv · 2607.25099

Spin resummation of heavy quarkonium photoproduction: from the gluonic gravitational form factors to the holographic pomeron

Kiminad A. Mamo·Kemal Tezgin·Christian Weiss
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Abstract

Exclusive heavy quarkonium photoproduction probes the proton's gluonic structure from near-threshold (fixed-spin exchanges, gravitational form factors) to high energies (reggeized dynamics). We construct a holographic QCD amplitude that resums the even spin-$j$ gluonic exchanges, with the spin-2 input fixed by lattice QCD GFFs. The new framework describes the $J/\psi$ cross section from JLab to HERA energies in a unified manner. It explains why the spin-2 exchange model for GFF extraction near threshold is not a controlled approximation and suggests how to improve it.

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Kiminad A. Mamo, Kemal Tezgin, Christian Weiss. 2026-07-27. Spin resummation of heavy quarkonium photoproduction: from the gluonic gravitational form factors to the holographic pomeron. https://arxiv.org/abs/2607.25099

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